Base for a shower stall



FIG. 1 is a top isometric view of a base for a shower stall showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a cross sectional view taken on line 6--6 of FIG. 1; and,

FIG. 7 is a cross sectional view taken on line 7--7 of FIG. 1. 

The ornamental design for a base for a shower stall, as shown and described. 